Hydrogeological Conceptual Model of Makassar Coastal Area, South Sulawesi, Indonesia Sunu Ardhi Nugroho (a,c), Wahyu Wilopo (b), Ahmad Taufiq (c)
(a) Student Master of Geological Engineering, Faculty of Engineering, Gadjah Mada University, Yogyakarta, 55281
(b) Department of Geological Engineering, Faculty of Engineering, Gadjah Mada University, Yogyakarta, 55281
(c) Ministry of Public Works and Housing, Jakarta, 12110
Abstract
The rapid industrial growth and urban development of Makassar city on the edge of the Makassar Strait result in significant reliance on groundwater pumping. To assess the consequences of groundwater exploitation, it is necessary to understand the hydrogeological conceptual model. This study seeks to establish a hydrogeological conceptual model of the Makassar coastal area. The methodology involved collecting both primary and secondary data to identify study area boundaries, and also determining hydrostratigraphic system, characteristics of the aquifer, and hydrological conditions in the study area. The result indicates that the study area comprises three types of boundary conditions: river boundary, constant head boundary, and no-flow boundary, respectively Tallo, Jeneberang and Salo Sinrijala river, Makassar straits, and lithological contact between coastal alluvial and the Camba formation, and also Baturape Cindako volcanic. Hydrostratigraphic system of the study area comprises an unconfined aquifer that consist of sand and clay sand, an aquitard layer that consist of sandy clay, semi-unconfined aquifer that consist of sandstone and tuff sandstone, and an aquiclude layer that consist of clay and silt as the study area basement. Study area hydrological condition consists of parameters such as precipitation value is 3,145 mm/year, evapotranspiration value is 1,762 mm/year, runoff value is 532 mm/year, and groundwater recharge or infiltration is 852 mm/year. This hydrogeological conceptual model offers important information for groundwater modeling research in the Makassar coastal area.
Keywords: hydrostratigraphy, hydrogeological conceptual model, lithology subsurface, Makassar coastal area
Topic: Hydrology, hydrogeology, and geology engineering
